Encl. (1) to COMDTINST 16577.2
USCG DGPS CONOP
APPENDIX A: SERVICE ARCHITECTURE
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The U.S. Coast Guard DGPS Navigation Service architecture is shown in Figure 1. The functional
elements of the Service include:
Reference Station - Precisely located GPS receiving equipment with computer to calculate range
corrections based on comparison of satellite navigation messages and the known location of the
receiver.
Broadcast Site - A marine radiobeacon transmitting the GPS corrections to DGPS service users.
Integrity Monitor - Precisely located MSK radiobeacon receiver and GPS receiver capable of
applying, differential corrections. The corrected GPS position is compared to the known position to
determine if the correction broadcast is in tolerance.
Control Station - Centralized control of DGPS service elements. Location is staffed by a
watchstander 24 hrs/day. DGPS service performance data archiving and processing is accomplished
here:
Communication Network - Provides connectivity between sites for passing performance data and
control commands using an X.25 Packet Switched Service.
DGPS User Equipment - Consists of two interfaced receivers with a display; a radiobeacon
receiver capable of MSK demodulation, and GPS receiver capable of applying differential
corrections from the radiobeacon receiver.
A-1
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